package gui;
import java.awt.BorderLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

	/*
	 * FileChooserDemo.java uses these files:
	 *   images/Open16.gif
	 *   images/Save16.gif
	 */
	public class FileChooserDemo extends JPanel
	                             implements ActionListener {
		
		private static final long serialVersionUID = 1L;
		static private final String newline = "\n";
	    JButton openButton, saveButton;
	    JTextArea log;
	    JFileChooser fc;

	    public FileChooserDemo() {
	        super(new BorderLayout());

	        //Create the log first, because the action listeners
	        //need to refer to it.
	        log = new JTextArea(5,20);
	        log.setMargin(new Insets(5,5,5,5));
	        log.setEditable(false);
	        JScrollPane logScrollPane = new JScrollPane(log);

	        //Create a file chooser
	        fc = new JFileChooser();

	        //Uncomment one of the following lines to try a different
	        //file selection mode.  The first allows just directories
	        //to be selected (and, at least in the Java look and feel,
	        //shown).  The second allows both files and directories
	        //to be selected.  If you leave these lines commented out,
	        //then the default mode (FILES_ONLY) will be used.
	        //
	        //fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
	        //fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

	        //Create the open button.  We use the image from the JLF
	        //Graphics Repository (but we extracted it from the jar).
	        openButton = new JButton("Open a File...",
	                                 createImageIcon("images/Open16.gif"));
	        openButton.addActionListener(this);

	        //Create the save button.  We use the image from the JLF
	        //Graphics Repository (but we extracted it from the jar).
	        saveButton = new JButton("Save a File...",
	                                 createImageIcon("images/Save16.gif"));
	        saveButton.addActionListener(this);

	        //For layout purposes, put the buttons in a separate panel
	        JPanel buttonPanel = new JPanel(); //use FlowLayout
	        buttonPanel.add(openButton);
	        buttonPanel.add(saveButton);

	        //Add the buttons and the log to this panel.
	        add(buttonPanel, BorderLayout.PAGE_START);
	        add(logScrollPane, BorderLayout.CENTER);
	    }

	    public void actionPerformed(ActionEvent e) {

	        //Handle open button action.
	        if (e.getSource() == openButton) {
	            int returnVal = fc.showOpenDialog(FileChooserDemo.this);

	            if (returnVal == JFileChooser.APPROVE_OPTION) {
	                File file = fc.getSelectedFile();
	                //This is where a real application would open the file.
	                log.append("Opening: " + file.getName() + "." + newline);
	            } else {
	                log.append("Open command cancelled by user." + newline);
	            }
	            log.setCaretPosition(log.getDocument().getLength());

	        //Handle save button action.
	        } else if (e.getSource() == saveButton) {
	            int returnVal = fc.showSaveDialog(FileChooserDemo.this);
	            if (returnVal == JFileChooser.APPROVE_OPTION) {
	                File file = fc.getSelectedFile();
	                //This is where a real application would save the file.
	                log.append("Saving: " + file.getName() + "." + newline);
	            } else {
	                log.append("Save command cancelled by user." + newline);
	            }
	            log.setCaretPosition(log.getDocument().getLength());
	        }
	    }

	    /** Returns an ImageIcon, or null if the path was invalid. */
	    protected static ImageIcon createImageIcon(String path) {
	        java.net.URL imgURL = FileChooserDemo.class.getResource(path);
	        if (imgURL != null) {
	            return new ImageIcon(imgURL);
	        } else {
	            System.err.println("Couldn't find file: " + path);
	            return null;
	        }
	    }

	    /**
	     * Create the GUI and show it.  For thread safety,
	     * this method should be invoked from the
	     * event-dispatching thread.
	     */
	    private static void createAndShowGUI() {
	        //Create and set up the window.
	        JFrame frame = new JFrame("FileChooserDemo");
	        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	        //Create and set up the content pane.
	        JComponent newContentPane = new FileChooserDemo();
	        newContentPane.setOpaque(true); //content panes must be opaque
	        frame.setContentPane(newContentPane);

	        //Display the window.
	        frame.pack();
	        frame.setVisible(true);
	    }

	    public static void main(String[] args) {
	        //Schedule a job for the event-dispatching thread:
	        //creating and showing this application's GUI.
	        javax.swing.SwingUtilities.invokeLater(new Runnable() {
	            public void run() {
	                createAndShowGUI();
	            }
	        });
	    }
}

